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How it works:
Wireless networks is networking devices to one another to transfer data, and communicate with each other.
Networking is done by nodes, and PCI cards.
Radio Frequency:
RF waves ranges from 2.4 to 2.48 GHz bandwidth.
Short waves i.e. FM/AM radio, TV, cell phones…
Radio Frequency
Frequency Hopping Spread Spectrum (FHSS) transmission hops from one
channel to another channel till one is free. Divides the 2.4 GHz bandwidth
Direct-Sequence Spread Spectrum. (DSSS) is a transmission technology used in
LAWN transmissions where a data signal at the sending station is combined with a higher data rate bit sequence
Infrared Transmission
Shorter range than RF
More secure
Requires a line of sight
Interruption by sunlight
IEEE 802.11:
IEEE 802.11 sets the standards for wireless networks
Architectures: two options in configuring a network:
Ad-Hoc
1. Ad-Hoc- constructing a network “on the fly”
No fix pointsNo structureCommunicates by nodes; all nodes can transmit to other nodesOne master computer/device while others are the slave.
Infrastructure
Fixed network access points with mobile nodes
Access points are connected to landlines to bridge other wireless nodes to wired nodes, similar to cellular networks.
IEEE 802.11 Layers
Physical (PHY) layer The PHY actually handles the transmission of
data between nodes.
IEEE 802.11 Layers
Medium Access Control (MAC) layer. The MAC layer set protocols to maintain order
when sharing of data. CSMA/CA RTS CTS CRC ACK
Wireless LAN Products
PCMCIA Wireless PC Card Compaq WL110
Buffalo WL-PCM-L11
PCI Card Compaq WL210
Buffalo
Access Point (AP) Compaq WL410
D-Link DWL-900AP
Router SparkLAN WX-5000
Compaq WL110
Used for enterprise, small or medium business, and home office11 MbpsSecure Internet Access128 bit Wired Equivalent Privacy(WEP) encryption
Buffalo WL-PCM-L11
High speed wireless connection, up to 11 Mbps
Plug and Play installation
Integrated antenna
Compaq WL210
Extends wireless network to desktops, point of sale, and other non-portable devices
External antenna jack
Compaq WL410
Extends the range of cabled Ethernet network, providing easy network access to mobile users and difficult to wire locations
128-bit Wired Equivalent Privacy (WEP) encryption
Investment protection
Doubling network capacity
Lower network management costs
D-Link DWL-900AP
Point-to-point bridging capabilityWith a DHCP server, the DWL-900AP will automatically obtain an IP address.128-bit WEP (Wired Equivalent Privacy)a USB port is provided for flexibility in configuring the device
The benefits of using wireless network
·Mobility ·Installation Speed and Simplicity ·Installation flexibility ·Reduced Cost –of –Ownership
Mobility
LAN systems can provide the user with access to information anywhere in their organization. This mobility supports productivity and service opportunities not possible with wired networks.
Installation Speed and Simplicity
Wireless LAN systems can be installed fast and easy and can eliminate the need to pull cable through walls and ceilings.
Reduced Cost –of –Ownership
While the initial investment required for wireless LAN hardware can be higher than the cost of wired LAN, overall installation expenses and life-cycle costs can be significantly lower. Long-term cost benefits are greatest in dynamic environments requiring frequent moves and changes.
Wireless LAN in your industry
Corporate: Corporate employees can take advantage of mobile networking for e-mail, file sharing, and web browsing regardless of where you are in the office or outside the building.
Education: Enable users with notebook computers to connect to the university network for collaborative class discussions and to the Internet for e-mail and web browsing.
Manufacturing & Warehouse: Link factory floor workstations and data collection devices to a company’s network. Improve inventory tracking and reduce the costs of physical inventory counts.
The Future of wireless LAN
Many companies have invest Wireless LAN market Price come down Small and Home business grow up fast Home networking will be popular
Many companies have invest
A lot of companies have begun to invest about the wireless networking, such as Intel , Microsoft , IBM etc.Microsoft built wireless support into the successor to windows 9x, NT and later version.
Wireless LAN Market
The wireless data rate, for instance, is a scorching fast 11 Mbps, up to 10 times faster than the most popular home networking products.
It is more fit on the most business, such as transfer data, communication and Net meeting.
Price come down
When the supply of the wireless network device become greater than the demand, user can spend a low price and get more effective device.
Home and small business grow up fast
When the price of the wireless LANs devices are going to be more user affordable, then small and home business wireless networking will become more popular.
Home networking increasing
Market research firm Yankee Group predicts that wireless LANs will make up a quarter of home networks by 2003.